to be not worth mentioning
... 不足为道 to be not worth mentioning 布琼尼帽 budyonovka 踩道 to scout, to reconnoitre ...
Difficult for outsiders to ; no use to tell others ; let's keep this between ourselves
Trivial
little
不足为道,汉语成语,拼音是bù zú wéi dào,意思是不值得一说。出自《二刻拍案惊奇》。